Chris Raymond

Thanks everybody for your help with this. AMI contacted Hegner on my behalf (great folks at AMI), and as I suspected this is not a part I can buy (the coil is riveted, not screwed, to the motor end cap so it's not intended to be replaced by the user). I also contacted the Facebook user "Hegner, A Saw Subject" and got an automatic reply that technical support is no longer provided. So it looks like my options, best to worst, are 1) find a dead motor and scavenge its pickup coil, 2) find someone parting out a similar saw and buy the motor, 3) try to wind a coil myself and mount it to the motor, 4) find a cheap BLDC motor with speed control and adapt it to the saw, 5) buy a new motor from Hegner for ~ $750, or 6) replace the saw with a different one. I'll post if I succeed in getting the saw going again.

Thank you everybody! The saw is unusable at max speed - the blades break instantly. It'll be good to have it running right again.

Hi, my old (1990) Hegner Multimax-18 speed control has stopped working (max speed all the time regardless of the knob setting). Being an EE I probed the speed control PCB and I believe it's functioning OK. However the tachometer pickup coil on the motor (see photo) reads open when I measure it. If it's really a coil and not some Hall Effect sensor or something I would expect a few hundred or maybe a few thousand ohms when measuring the coil but it's definitely reading open. So it appears to have failed, which would explain why the speed control isn't working. Can anybody tell me: 1. Is the pickup on the motor just a simple coil? Or something more exotic? This saw was built in 1990 so I suspect it's not too exotic. 2. Can I buy a replacement coil? If so, where? A replacement motor is something like $750 so definitely not going that route 3. Does anyone have fried motor they'd like to sell, so I can salvage its coil? The coil is shown in the third photo, it's the device above the motor shaft with two wires coming out. Thank you!